If you have just the regular warranty, it is only valid in the country you purchased it in.
If you actually purchased Applecare plus, here is a link to the terms.
https://www.apple.com/legal/sales-support/applecare/applecareplus/us/
You can choose your date of purchase and then look at the terms; I chose April - September 2021 - see this paragraph on page 3:
Please note that if you seek service under this Plan in a country other than your country of
purchase, the service fee will need to be paid in that country’s currency and at that country’s
applicable rate – for further details, including regarding applicable fees by country, please visit
the AppleCare+ support website at apple.com/legal/sales-support/applecare/applecareplus/.
That appears to indicate that your device would be covered by Applecare + in other countries. Best to check with Apple since we are all just other users.